| Cyan Energy AS | Manufacturing | 2021 |
| Cygni Holding AS | Information & communication | 2020 |
| Cygnus Holding AS | Financial services | 2013 |
| Daaegården AS | Real estate | 2007 |
| Daaekvartalet Kompetanse AS | Professional & scientific | 2014 |
| Daaeskogen Eiendom AS | Real estate | 1997 |
| Daaeskogen Forlag AS | Information & communication | 2023 |
| Daaeskogen Tannlegesenter AS | Health & social care | 1998 |
| Daaetunet AS | Real estate | 2021 |
| Daaetunet Omsorgsboliger AS | Real estate | 2022 |
| Dailyuse Technology AS | Information & communication | 2009 |
| Dal Taxi AS | Transport & logistics | 2022 |
| Dale Invest AS | Wholesale & retail | 1986 |
| Dale Park AS | Real estate | 2020 |
| Dale Revisjon AS | Professional & scientific | 2005 |
| Dambla AS | Real estate | 2021 |
| Dampsagveien 10 AS | Real estate | 2022 |
| Dampsentralen AS | Hospitality | 2018 |
| Danieiendom AS | Education | 2020 |
| Danimo AS | Wholesale & retail | 2005 |
| Dankert Schlyder AS | Wholesale & retail | 1999 |
| Daryaz Holding AS | | 2025 |
| Data Assistanse AS | Wholesale & retail | 1997 |
| Datsuh AS | Information & communication | 2023 |
| Daystrom Technologies AS | Information & communication | 2023 |
| DB Maskin & Transport AS | Transport & logistics | 2017 |
| DBK Kaya Holding Ink AS | | 2026 |
| DBK Kayama Ink AS | Other services | 2026 |
| Deca Eiendom AS | Real estate | 2005 |
| Deepvoyant AS | Information & communication | 2026 |
| Defloat AS | Agriculture & fishing | 2016 |
| Defloat Austevoll AS | Administrative & support | 2019 |
| Degirmenci Holding AS | | 2018 |
| Dekkcenteret AS | Wholesale & retail | 1976 |
| Dekkcenteret Ålesund Eiendom AS | Real estate | 2013 |
| Delta Aktivt AS | Education | 2013 |
| Demingane Eiendom AS | Real estate | 2025 |
| Den Lille Krambu Ans | Wholesale & retail | 1995 |
| Den Norske Matfestivalen I Ålesund AS | Arts & recreation | 1999 |
| Dental Holding AS | | 2022 |
| Dento Holding AS | | 2024 |
| Dento Invest AS | Health & social care | 2005 |
| DENTO2 AS | Health & social care | 2024 |
| Design Ditt Kjøkken AS | Wholesale & retail | 2018 |
| Designal AS | Professional & scientific | 2024 |
| Designtepper Ans | Wholesale & retail | 2010 |
| Desima AS | Professional & scientific | 2000 |
| Detalj Rauma Eiendom AS | Real estate | 2008 |
| Develonia AS | | 2021 |
| Devisor AS | | 2011 |
| Devold Aalesund AS | Transport & logistics | 2002 |
| Devold Holding AS | Professional & scientific | 2012 |
| Devold Teknologi AS | Professional & scientific | 2021 |
| DH Kapital AS | Real estate | 2020 |
| Diamond Property AS | Real estate | 2013 |
| Digerneset Eiendom AS | Real estate | 2012 |
| Digerneset Elektro & Kjøkken AS | Wholesale & retail | 2020 |
| Digerneset Vest AS | | 2018 |
| Digikom AS | Information & communication | 2008 |
| Digital Kommunikasjon AS | Information & communication | 1997 |
| Dik Holding AS | Real estate | 2020 |
| Diligen AS | Information & communication | 2012 |
| Dillon Eiendom AS | Real estate | 2008 |
| Dillon Flis AS | Construction | 2011 |
| Dimmen Forvaltning AS | Real estate | 2024 |
| Dimmencorp AS | | 2020 |
| Din Livsveileder AS | Education | 2026 |
| Din Vaktmester Hopland AS | Administrative & support | 2021 |
| Dipai AS | Information & communication | 2020 |
| Divinity AS | Other services | 2024 |
| Djurny AS | Wholesale & retail | 2020 |
| DLH Service AS | Manufacturing | 2015 |
| Dms-Holding AS | | 2026 |
| Dock Site AS | Hospitality | 2024 |
| Dolmen & Sønner AS | Construction | 1995 |
| Doxa Holding AS | Professional & scientific | 2011 |
| Doxacom AS | Professional & scientific | 2013 |
| DP Viking AS | Wholesale & retail | 2021 |
| DP Ålesund AS | Hospitality | 2026 |
| Drabløs AS | Wholesale & retail | 1987 |
| Drabløs Eiendom AS | Real estate | 1987 |
| Drabløshus AS | Real estate | 2023 |
| Dragebygget AS | Real estate | 2025 |
| Dreg AS | Professional & scientific | 2007 |
| Drevik Eiendom AS | Real estate | 1988 |
| Drevik Holding AS | Real estate | 1988 |
| Drevik International AS | Wholesale & retail | 1995 |
| Dreyers AS | Real estate | 2023 |
| Dreyes Holding AS | Health & social care | 2018 |
| Drivkraftx AS | Professional & scientific | 2024 |
| Drom Engineering AS | Professional & scientific | 2019 |
| Drotningsvik Holding AS | | 2019 |
| Dråpe Holding AS | | 2025 |
| Dråpe Ålesund Kaffehus AS | Hospitality | 2019 |
| DSN Consulting AS | Professional & scientific | 2018 |
| Ducra Holding AS | Real estate | 2005 |
| Duke AS | Professional & scientific | 2023 |
| Dybdal Invest AS | Wholesale & retail | 2005 |
| Dyber AS | Professional & scientific | 2018 |
| Dybvik Finans AS | | 2025 |